Puller tool having a manually operated sliding hammer



Jan. 29, 1957 L. G. ALLEN FULLER TOOL HAVING A MANUALLY OPERATED SLIDINGHAMMER Filed Oct. 20. 1952 2 Fig. l.

IN V EN TOR.

L'EO 5. ALLEN AGENTS United States Patent PULLER TOOL HAVING A MANUAIJLY OPERATED SLIDING HAMMER Leo G. Allen, SanDiego, Calif.

Application October 20, 1952, Serial N 315,653

1 Claim. (Cl. 29-254) The-present invention relates generally to pullertools and more particularly to a puller having opposed pivoted jawsWhich can be adjusted for engaging and removing grease caps or the like,the device including a hammer slidably mounted on the shank of the tool,the tool being also used in installation and replacement of grease capsor the like.

The primary object of this invention is to provide a knock-oft pulleradaptable for removing and replacing grease caps from automobile wheelhubs or the like without damaging the relatively thin walled caps.

Another object of this invention is to provide a knockoff puller havinga clamp portion adjustable for grasping various sizes of grease caps orthe like.

Another object of this invention is to provide a knockoff puller of thetype described having a sliding hammer thereon to provide suflicientforce of inertia for removing and replacing grease caps or the like.

Another object of this invention, ancillary to the preceding objects, isto teach the best known mode. of implementing the principles of theinvention in carrying the invention into actual practice.

Another object of this invention is to provide a knockoii puller whichis adapted for fabrication from many ditfei'ent materials, so that thechoice of material can be according to the dictates of availability andprice considerations, the exact sizes and proportions being matterseasily determined to suit particular conditions and needs.

Another object of this invention is to provide a knockofi puller whichis inexpensive and practicable to manufacture.

Finally, it is an object to provide a knock-01f puller of theaforementioned character which is simple, safe and convenient tooperate, and which will give generally eflicient and durable service.

With these and other objects definitely in view, this invention consistsin the novel construction, combination and arrangement of elements andportions, as will be hereinafter fully described in the specification,particularly pointed out in the claim, and illustrated in the drawingwhich forms a material part of this disclosure and wherein similarcharacters of reference indicate similar or identical elements andportions throughout the specifi cation and throughout the views of thedrawing, and in which:

Fig. 1 is a side elevation view of the device.

Fig. 2 is a sectional view taken on the line 2--2 of Fig. 1.

Fig. device.

Referring now to the drawing in detail the device comprises a handleportion and a clamp portion 12. The handle assembly 10 comprises a shank14 having a screw threaded portion 16 which is engaged with a screwthreaded hole 18 in a handle 20. The hand grip 20 is secured to theouter end of the shank 14, and a plate-like hand shield 22 is secured atthe inner end of the hand grip by means of a lock nut 24.

3 is an isometric view of the clamp portion of the 2,779,089 PatentedJan. 29, 1957 A hammer 26 is axially bored and slidably mounted on theshank 14,said hammer being of suitable heavy metal to provideconsiderable force of inertia when struck against the lock nut 24. Theremaining end of the shank 14 is provided with a screw threaded portion28 which is engaged with a screw threaded hole 30 in a bearing block 32,said bearing block being integrally formed with a cross bar 34 which isretained in position on the shank 14 by means of a lock nut 36.

The clamp portion 12 comprises jaws 38 and 40 each having a slot 42, theportions of the jaw on either side of the slot being lugs 44 which areoutwardly bent normal at their ends to comprise hinge elements 46. Thehinge elements 46 are pivotally mounted to terminal tongues 48 of thecross bar 34 by means of hinge pins 50, said tongues being a close fitwithin the slots 42 as illustrated in Fig. 3. The jaws 38 and 40 arebent at their other ends to form lips 52 which project on the oppositeside of said jaws from the hinge elements 46, said lips having arcuaterecesses 54 provided with serrations 56.

The jaws 38 and 40 are adjusted by means of a clamp screw 58 having aright hand threaded portion 60 and a left hand threaded portion 62having the same pitch and of slightly smaller diameter than said righthanded threaded portion. The clamp screw 58 is rotatably mounted in thebearing block 32 and is retained by a washer 64 secured against theshoulder 66, formed by the increase in diameter of said clamp screw atthat position, and by a. washer 68 welded or suitably secured to theleft hand threaded portion 62 as illustrated in Fig. 2. The clamp screw58 is threadedly engaged with suitable nuts 70 and 72, each of said nutshaving grooves 74 of such a depth that the nuts may be slidably fittedwithin the slots 42. The spacing of the roots of the grooves 74 isrelated to the Width of the slots 42 so that the nuts will be preventedfrom rotating, said grooves also being of sufficient width that the nuts70 and 72 may remain in free alignment with the clamp screw regardlessof the angular position of the jaws 38 and 40 during adjustment. Theclamp screw 58 is further provided with a T-handle 76 secured in theright hand threaded portion 60 to provide sufficient leverage foradjusting the jaws 38 and 40.

To remove a grease cap, the device is placed with the jaws 38 and 40 oneither side of said grease cap and the jaws are adjusted by means of theclamp screw 58 until the grease cap is firmly clamped between the lips52. The hammer 26 is then repeatedly slid along the rod 14 striking thelock nut 24 thus providing a series of sharp pulls on the grease capcausing it to be removed from its seating. The fingers of the operatorare protected from accidental blows of the hammer by the shield 22.

When the tool is used for installing or replacing a grease cap or otherunit, the jaws are first clamped thereon and the hammer is reciprocatedagainst the lock nut 36 to drive the unit into place without damagingit.

It will be obvious that the use of the device is not limited to theremoval of grease caps but may also be applied to the removal ofbearings, collars or the like, the versatility being limited only by thesize and adjustment of the clamp portion.

The operation of this invention will be clearly comprehended from aconsideration of the foregoing description of the mechanical detailsthereof, taken in connection with the drawing and the above recitedobjects. It will be obvious that all said objects are amply achieved bythis invention.

Further description would appear to be unnecessary. It is understoodthat minor variation from the form of the invention disclosed herein maybe made without departure from the spirit and scope of the invention,and

arrange that the specification and drawing are to be considered asmerely illustrative rather than limiting.

I claim:

A puller tool comprising a bearing block, a handle fixed to said block,a cross bar having its central portion fixed to said block, opposingjaws pivoted to the ends of said cross bar, and a clamp screw having itscenter portion rotatably mounted in said block and having oppositelythreaded end portions, of different diameters whereby a shoulder isdefined between said portions said central por- 7 tion having saidshoulder on one side of said block and a washer element secured to thesmaller of said portions on the other side of said block in frictionalabutment with said block whereby axial movement of the screw relative tothe block is prevented, said jaws having opposed slots in portionsthereof adjacent said cross bar, correspondingly threaded nuts beinglaterally grooved for a sliding fit in said slots, whereby said nuts arenon-rotatively mounted in said slots, said nuts threadedly engaging saidend portions and being somewhat loosely engaged in said slots to permitslight pivotal movement and thus to avoid binding, said slots being openat the ends of the jaws adjacent to said cross bar whereby the nuts areeasily assembled onto the jaws during construction and repair means torotate said screw to open and close said jaws, said handle including anelongated shank, a stop on the handle, said shank extending transverselyof said screw from the side of said cross bar remote from said jaws, anda manually operable hammer mounted on said shank for sliding movementaxially thereof and engageable with said stop.

References Cited in the file of this patent UNITED. STATES PATENTS

